That's not quite right. Your tactic might handle the Moorean absurdity ("it's raining but I don't believe that it's raining"), but there's a variant: "it's rain

That's not quite right. Your tactic might handle the Moorean absurdity ("it's raining but I don't believe that it's raining"), but there's a variant: "it's raining, and I'm certain that it's not raining" that it doesn't handle.